FrontEndDynamicExpression

is a global front end option that specifies an expression to be dynamically updated whenever the front end is running.

Details

FrontEndDynamicExpression->Dynamic[expr] causes the expression to be tracked and updated in the usual way, except that expr is not displayed anywhere.
FrontEndDynamicExpression can be set on any valid front end object such as $FrontEnd or $FrontEndSession.

Examples

open all close all

Run a dynamic expression that prints the number of open notebooks:

Restore the default value of FrontEndDynamicExpression:

Dynamic can be omitted from the right-hand side if :> is used in SetOptions:

Similarly, Dynamic can be omitted from the right-hand side if := is used in CurrentValue:

As with any other Dynamic expression, Refresh may be used to control reevaluation:

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